Manufacture of fertilizers



Patented Mar. :3, 192*.

; mm Sm enonens vcnr unn, on ran-1s, rnancn, assronon ro soci'ncrn LAIR-LiQiIIDFi (soc rn'rn VANONYME ro'oa LETUDE ET, LEXPLOITATION nnsignoc nnns e'eonens CLAUDE),

or rams, rnencn.

No Drawing. Application filed December '20, 192s, serie1-no. es1,s21;.

' r Renewed'Augusti, 192s.

This invention relates to fertilizers and has special reference to a fertilizer contain ing combined nitrogen and potassium and composed substantially of potassium chloride and ammonium chloride.

According to this invention a processfor the manufacture of a fertilizer consists in employing sylvinite (a crude salt consisting essentially of potassium chloride chloride and containing small quantities of magnesium salts, calcium salts and other potassium salts) or a slmilar mineral'under appropriate conditions in place of the so dium chloride which isemployed in the well 15 known reaction of ammonium bicarbonate i and sodium chloride in the presence of Water (which reaction yields sodium bicarbonate andammonium chloride), whereby a product is obtained containing both nitrogen and potassium which is of considerable importance as'a fertilizer. By means of this substitution the sodium chloride contained in the sylvinite, and which is useless if not prejudicial in the use of the sylvinite as a fertilizen is converted into ammonium chloride which joins the potassium chloride already contained in the sylvinite. There is thus obtained a fertilizer containing ammonium chloride and potassium chloride and in which both nitrogen and potassium in the combined condition are present. This substance. contrary to sylvinite is but very little'deliques- ,cent and is particularly advantageous for use for agricultural purposes. Theabov'e process for the production of the ammonium chloride-potassium chloride product fromsylvinite can in its practical application be carried out according to a variety of methods. such as those whichare I already known (for example the Schreib as described in German Patent No. 36,093 and other processes) for the precipitation of the sodium bicarbonate and the ammonium chloride from the same solution. The sylvinite may be utilized eitherin the solid state or in the form of a solution, and in all cases it is found that the potassium chloride does not interfere with the operations and crystallizes at the same time as the ammonium chloride, whilst the sodium chloride is practically wholly converted into bicarbonate of soda.

To obtain the desired product in accorda'nd sodium iranuriicr'nnn or rna'rinrzniasif ending Brande January 24, 1923.

crating for instance according to. 'Britis Patent l lo. 131.87 0, there is takenthel'iquor from which the bicarbonate of sod'a jhas been separatedas will be seen below;

c Thisliquor is passed into a i stirrer and a cooling coil. Whilst'th'e' stir- H2O Insoluble matters 9.4 Potassium chloride; l 31.5 Sodium chloride 58.6.

the original liquor There are also added per e1ibie metre of "ance with the present; inventiomiwhilst 6 centigrade. The ammonium chloride fprecipitates with'the chloride of potas'siuni; the

stirrer is stopped; the solid product is 'cen ing apparatus in which they. are diluted with 150 litres of water per cubic. meter of. the original liquor.

Carbon T dioxideis passed lnto 1t in order to precipitate the bicarbonate,

of soda. The latter isseparated, washed and filtered and the remaining'mother liquor. is

the one which has beentakenat the begin i I taneously 15.2 percent nitrogen and 20.2

ning of the operationand again treated as above. I r In this manneri'from eachlOO kgs. ofs'yl vinite there are produced 166 kgs. of the above product utilizable as fertilizer and consisting mainly of ammonium and potassium chlorides; its approximate percentage composition is: Water 1.7 Insoluble matters 6.8 Potassium chloride 32.1 Ammonium chloride 58 Sodium chloride- 1.4 that is to say, a fertilizer containingsimulchloride.-

dium chloride which is known to have a favorable effect on the growing of plants in such proportion.

i laiInS 1- i p i 1. A process for the manufacture of a ferti-lizer which comprises treating a mineral containing both potassium chloride and sodium chloride with carbon dioxide, ammonia and water to form sodium bicarbonate and ammonium chloride.

2(A process for the manufacture of a fertilizer which comprises treating sylvinite sodium chloride with carbon dioxide, am-

monia and water to form bicarbonate of soda and ammonium chloride and separately precipitating sodium bicarbonate and am-' 'mQ JJ-um chloride from the same solution.

4. A process for the manufacture of a fertilizer which comprises treating a mineral containing both potassium chloride and sodium chloride with carbon dioxide, am Inonia and water to form sodium bicarbonate and ammonium chloride and collecting the potassium chloride and the ammonium -5. A process for the manufacture ofv a V fertilizer which comprises treating a solu 1 tlon containlng both potassium chloride and 3 7 sodium chloride with carbon dioxide and ammonia to form sodium bicarbonate and mmonium chloride 6. A process for the 'Inanufacture of a fertilizer which comprises treating a solution of sylvinite with carbon dioxide and ammonia to form sodium bicarbonate and ammonium chloride.

1.7. A process for the manufacture of a fertilizer which comprises adding to the liquor which containssodium bicarbonate,

' a mineral in the solid state containing both po a um chloride andsodium' chloride, am-

monia and carbon dioxide, cooling the solu tion to'eliminate the ammonium chloride and the potassium chloride by precipitation, treating the remaining liquor with carbon dioxide to precipitate sodium bicarbonate and returning the remaining liquor to the process.

'8. A process for the manufacture of a fercarbon dioxide, ammonia and water while leaving its poi'assi-um chloride substantially unchanged. v

I 1-0. A process for the utilization of sylvinite which consists in converting its sodium chloride int-o ammonium chloride by subjecting it to the action of carbon dioxide, ammonia and water while leaving its potas sium chloride substantially unchanged. I

11. A new solid product utilizable as a fer tilizcr which obtained by treating a substance containing both potassium chloride and sodium chloride with carbon vdioxide and ammonia to form sodium bicarbonateand separating this bicarbonate, 7 12. l new solid product utilizable as a fertilizer which .is a mixture consisting substantially of potassium chloride, and ammonium chloride, the latter having been formed by the conversion of the sodi um chloride of a mineral containing both'potassium chloride and sodium chloride.

13. A ncwvsolid product'utilizable r fertilizer which is a mixture consistingv vtbstantially of potassium chloride vand am monium chloride, both having been simultaneously obtained ina solid state from a solution of a mineral containing both potas sium chloride and sodium chloride treated with carbon dioxide and ammonia andjafter the separation of thesodium bicarbonate forme l. v i

In testimony whereof I, Gnonons CLAUDE, have signed this specification.

GEORGES CLAUDE. 

